Add scale factor tag to data packs

ui/base/resource/resource_bundle_linux.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/base/resource/resource_bundle.h"
 
 #include "base/path_service.h"
 #include "ui/base/ui_base_paths.h"
 
 namespace {
 
 FilePath GetResourcesPakFilePath(const std::string& pak_name) {
   FilePath path;
   if (PathService::Get(base::DIR_MODULE, &path))
     return path.AppendASCII(pak_name.c_str());
   return FilePath();
 }
 
 }  // namespace
 
 namespace ui {
 
 void ResourceBundle::LoadCommonResources() {
-  AddDataPack(GetResourcesPakFilePath("chrome.pak"));
-  AddDataPack(GetResourcesPakFilePath("theme_resources_standard.pak"));
-  AddDataPack(GetResourcesPakFilePath("ui_resources_standard.pak"));
+  AddDataPack(GetResourcesPakFilePath("chrome.pak"), 1.0);
+  AddDataPack(GetResourcesPakFilePath("theme_resources_standard.pak"), 1.0);
+  AddDataPack(GetResourcesPakFilePath("ui_resources_standard.pak"), 1.0);
+
+#if defined(ENABLE_HIDPI)
+  AddDataPack(GetResourcesPakFilePath("theme_resources_2x.pak"), 2.0);
+  AddDataPack(GetResourcesPakFilePath("ui_resources_2x.pak"), 2.0);
+#endif
 }
 
 }  // namespace ui